Unit 1, Lesson 1
Múltiplos de un número
Grado 4
Preparation
Lesson Narrative
In grade 3, students learned how to find the area of a rectangle by tiling and found that multiplying the side lengths yields the same result.
The purpose of this lesson is for students to apply their understanding of area and multiplication to build rectangles and find their area. As students consider the areas of rectangles with a given side length, they explore the idea of multiples. Students learn that a multiple of a number is the result of multiplying that whole number by another.
While students are introduced to the term multiple in this lesson, they work more with it in upcoming lessons. They do not need to have a formal understanding of the term in this lesson. In upcoming lessons, students also explore and learn the terms factor and factor pair. In this lesson, they refer to factors and factor pairs as side lengths within the context of area.
Math Community
In the Lesson Synthesis, students discuss what it means to be a part of a mathematical community. Prepare a Math Community poster by drawing a two-column chart as shown. Note that there are sections for students and the teacher to emphasize that both parties are responsible for the way math is done in the classroom. In this lesson, students add their ideas to the “Doing Math” column. In upcoming lessons, students will add to and revise these ideas, including drafting classroom goals and expectations for the “Norms” column. Keep the poster displayed in the classroom.
- Representation
- MLR2
- Comprehend (in spoken language) the meaning of the phrase “multiple of a number.”
- Create (using other representations) rectangles given a side length and determine their area.
- Construyamos algunos rectángulos.
Required Preparation
Create a chart as described in the lesson narrative.
- Each group of 2 needs at least 36 tiles.
- Each group of 2 needs at least 36 tiles from the previous activity.
Teacher Reflection Questions
In grade 3, students fluently multiplied and divided within 100 and related area to multiplication and addition. How is that prior knowledge supporting students in understanding multiples in this lesson?